can someone explain this ?

Question

int main()
{
int x=3;
while(x++<10){
}
cout<<x; //output 11
return 0;
}

Answer 1

The 'cout' is outside the loop, 'x++ < 10' becomes false (and loop stops) at '10 < 10', but the post-increment is adding 1 after that line of code so you end up having 11.
post-increment adds 1 after the instruction while pre-increment adds immediately/before.